Flyback booster, LED backlight drive circuit, and liquid crystal display

摘要

The present invention discloses a flyback type booster circuit, and further provides an LED backlight driving circuit including the flyback type boosting circuit and a liquid crystal display including the backlight driving circuit. The flyback booster circuit includes a transformer having n primary coils and one secondary coil, a switch module having n switching elements, a driving module, and an output diode. The dot ends of the n primary coils are connected to the n switching elements in a one-to-one correspondence, the other end of the primary coil is connected to the input voltage, and the dot ends of the secondary coil are The output diode is connected to the positive end of the output diode, the other end is grounded, an output capacitor is connected between the negative end of the output diode and the ground, and the drive module has n switching elements within the time of the duty ratio D. In order to control to open one of them in order, a control signal is provided to each of the n switching elements, and the duty cycle of the n switching elements is provided. The sum of the ratios is D, n is an integer of 2 or more.